src/config.c

   1 #include <fcntl.h>
   2 #include <resolv.h>
   3 #include <signal.h>
   4 #include <arpa/inet.h>
   5 #include <unistd.h>
   6 #include <libgen.h>
   7 #include <string.h>
   8 #include <sys/stat.h>
   9 #include <syslog.h>
  10
  11 #include <uci.h>
  12 #include <uci_blob.h>
  13
  14 #include "odhcpd.h"
  15
  16 static struct blob_buf b;
  17 static int reload_pipe[2];
  18 struct list_head leases = LIST_HEAD_INIT(leases);
  19 struct list_head interfaces = LIST_HEAD_INIT(interfaces);
  20 struct config config = {.legacy = false, .main_dhcpv4 = false,
  21                         .dhcp_cb = NULL, .dhcp_statefile = NULL,
  22                         .log_level = LOG_INFO};
  23
  24 enum {
  25         IFACE_ATTR_INTERFACE,
  26         IFACE_ATTR_IFNAME,
  27         IFACE_ATTR_NETWORKID,
  28         IFACE_ATTR_DYNAMICDHCP,
  29         IFACE_ATTR_IGNORE,
  30         IFACE_ATTR_LEASETIME,
  31         IFACE_ATTR_LIMIT,
  32         IFACE_ATTR_START,
  33         IFACE_ATTR_MASTER,
  34         IFACE_ATTR_UPSTREAM,
  35         IFACE_ATTR_RA,
  36         IFACE_ATTR_DHCPV4,
  37         IFACE_ATTR_DHCPV6,
  38         IFACE_ATTR_NDP,
  39         IFACE_ATTR_ROUTER,
  40         IFACE_ATTR_DNS,
  41         IFACE_ATTR_DOMAIN,
  42         IFACE_ATTR_FILTER_CLASS,
  43         IFACE_ATTR_DHCPV6_RAW,
  44         IFACE_ATTR_RA_DEFAULT,
  45         IFACE_ATTR_RA_MANAGEMENT,
  46         IFACE_ATTR_RA_OFFLINK,
  47         IFACE_ATTR_RA_PREFERENCE,
  48         IFACE_ATTR_RA_ADVROUTER,
  49         IFACE_ATTR_RA_MININTERVAL,
  50         IFACE_ATTR_RA_MAXINTERVAL,
  51         IFACE_ATTR_RA_LIFETIME,
  52         IFACE_ATTR_RA_USELEASETIME,
  53         IFACE_ATTR_RA_REACHABLETIME,
  54         IFACE_ATTR_RA_HOPLIMIT,
  55         IFACE_ATTR_RA_MTU,
  56         IFACE_ATTR_PD_MANAGER,
  57         IFACE_ATTR_PD_CER,
  58         IFACE_ATTR_NDPROXY_ROUTING,
  59         IFACE_ATTR_NDPROXY_SLAVE,
  60         IFACE_ATTR_MAX
  61 };
  62
  63 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
  64         [IFACE_ATTR_INTERFACE] = { .name = "interface", .type = BLOBMSG_TYPE_STRING },
  65         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
  66         [IFACE_ATTR_NETWORKID] = { .name = "networkid", .type = BLOBMSG_TYPE_STRING },
  67         [IFACE_ATTR_DYNAMICDHCP] = { .name = "dynamicdhcp", .type = BLOBMSG_TYPE_BOOL },
  68         [IFACE_ATTR_IGNORE] = { .name = "ignore", .type = BLOBMSG_TYPE_BOOL },
  69         [IFACE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
  70         [IFACE_ATTR_START] = { .name = "start", .type = BLOBMSG_TYPE_INT32 },
  71         [IFACE_ATTR_LIMIT] = { .name = "limit", .type = BLOBMSG_TYPE_INT32 },
  72         [IFACE_ATTR_MASTER] = { .name = "master", .type = BLOBMSG_TYPE_BOOL },
  73         [IFACE_ATTR_UPSTREAM] = { .name = "upstream", .type = BLOBMSG_TYPE_ARRAY },
  74         [IFACE_ATTR_RA] = { .name = "ra", .type = BLOBMSG_TYPE_STRING },
  75         [IFACE_ATTR_DHCPV4] = { .name = "dhcpv4", .type = BLOBMSG_TYPE_STRING },
  76         [IFACE_ATTR_DHCPV6] = { .name = "dhcpv6", .type = BLOBMSG_TYPE_STRING },
  77         [IFACE_ATTR_NDP] = { .name = "ndp", .type = BLOBMSG_TYPE_STRING },
  78         [IFACE_ATTR_ROUTER] = { .name = "router", .type = BLOBMSG_TYPE_ARRAY },
  79         [IFACE_ATTR_DNS] = { .name = "dns", .type = BLOBMSG_TYPE_ARRAY },
  80         [IFACE_ATTR_DOMAIN] = { .name = "domain", .type = BLOBMSG_TYPE_ARRAY },
  81         [IFACE_ATTR_FILTER_CLASS] = { .name = "filter_class", .type = BLOBMSG_TYPE_STRING },
  82         [IFACE_ATTR_DHCPV6_RAW] = { .name = "dhcpv6_raw", .type = BLOBMSG_TYPE_STRING },
  83         [IFACE_ATTR_PD_MANAGER] = { .name = "pd_manager", .type = BLOBMSG_TYPE_STRING },
  84         [IFACE_ATTR_PD_CER] = { .name = "pd_cer", .type = BLOBMSG_TYPE_STRING },
  85         [IFACE_ATTR_RA_DEFAULT] = { .name = "ra_default", .type = BLOBMSG_TYPE_INT32 },
  86         [IFACE_ATTR_RA_MANAGEMENT] = { .name = "ra_management", .type = BLOBMSG_TYPE_INT32 },
  87         [IFACE_ATTR_RA_OFFLINK] = { .name = "ra_offlink", .type = BLOBMSG_TYPE_BOOL },
  88         [IFACE_ATTR_RA_PREFERENCE] = { .name = "ra_preference", .type = BLOBMSG_TYPE_STRING },
  89         [IFACE_ATTR_RA_ADVROUTER] = { .name = "ra_advrouter", .type = BLOBMSG_TYPE_BOOL },
  90         [IFACE_ATTR_RA_MININTERVAL] = { .name = "ra_mininterval", .type = BLOBMSG_TYPE_INT32 },
  91         [IFACE_ATTR_RA_MAXINTERVAL] = { .name = "ra_maxinterval", .type = BLOBMSG_TYPE_INT32 },
  92         [IFACE_ATTR_RA_LIFETIME] = { .name = "ra_lifetime", .type = BLOBMSG_TYPE_INT32 },
  93         [IFACE_ATTR_RA_USELEASETIME] = { .name = "ra_useleasetime", .type = BLOBMSG_TYPE_BOOL },
  94         [IFACE_ATTR_RA_REACHABLETIME] = { .name = "ra_reachabletime", .type = BLOBMSG_TYPE_INT32 },
  95         [IFACE_ATTR_RA_HOPLIMIT] = { .name = "ra_hoplimit", .type = BLOBMSG_TYPE_INT32 },
  96         [IFACE_ATTR_RA_MTU] = { .name = "ra_mtu", .type = BLOBMSG_TYPE_INT32 },
  97         [IFACE_ATTR_NDPROXY_ROUTING] = { .name = "ndproxy_routing", .type = BLOBMSG_TYPE_BOOL },
  98         [IFACE_ATTR_NDPROXY_SLAVE] = { .name = "ndproxy_slave", .type = BLOBMSG_TYPE_BOOL },
  99 };
 100
 101 static const struct uci_blob_param_info iface_attr_info[IFACE_ATTR_MAX] = {
 102         [IFACE_ATTR_UPSTREAM] = { .type = BLOBMSG_TYPE_STRING },
 103         [IFACE_ATTR_DNS] = { .type = BLOBMSG_TYPE_STRING },
 104         [IFACE_ATTR_DOMAIN] = { .type = BLOBMSG_TYPE_STRING },
 105 };
 106
 107 const struct uci_blob_param_list interface_attr_list = {
 108         .n_params = IFACE_ATTR_MAX,
 109         .params = iface_attrs,
 110         .info = iface_attr_info,
 111 };
 112
 113 enum {
 114         LEASE_ATTR_IP,
 115         LEASE_ATTR_MAC,
 116         LEASE_ATTR_DUID,
 117         LEASE_ATTR_HOSTID,
 118         LEASE_ATTR_LEASETIME,
 119         LEASE_ATTR_NAME,
 120         LEASE_ATTR_MAX
 121 };
 122
 123 static const struct blobmsg_policy lease_attrs[LEASE_ATTR_MAX] = {
 124         [LEASE_ATTR_IP] = { .name = "ip", .type = BLOBMSG_TYPE_STRING },
 125         [LEASE_ATTR_MAC] = { .name = "mac", .type = BLOBMSG_TYPE_STRING },
 126         [LEASE_ATTR_DUID] = { .name = "duid", .type = BLOBMSG_TYPE_STRING },
 127         [LEASE_ATTR_HOSTID] = { .name = "hostid", .type = BLOBMSG_TYPE_STRING },
 128         [LEASE_ATTR_LEASETIME] = { .name = "leasetime", .type = BLOBMSG_TYPE_STRING },
 129         [LEASE_ATTR_NAME] = { .name = "name", .type = BLOBMSG_TYPE_STRING },
 130 };
 131
 132 const struct uci_blob_param_list lease_attr_list = {
 133         .n_params = LEASE_ATTR_MAX,
 134         .params = lease_attrs,
 135 };
 136
 137 enum {
 138         ODHCPD_ATTR_LEGACY,
 139         ODHCPD_ATTR_MAINDHCP,
 140         ODHCPD_ATTR_LEASEFILE,
 141         ODHCPD_ATTR_LEASETRIGGER,
 142         ODHCPD_ATTR_LOGLEVEL,
 143         ODHCPD_ATTR_MAX
 144 };
 145
 146 static const struct blobmsg_policy odhcpd_attrs[LEASE_ATTR_MAX] = {
 147         [ODHCPD_ATTR_LEGACY] = { .name = "legacy", .type = BLOBMSG_TYPE_BOOL },
 148         [ODHCPD_ATTR_MAINDHCP] = { .name = "maindhcp", .type = BLOBMSG_TYPE_BOOL },
 149         [ODHCPD_ATTR_LEASEFILE] = { .name = "leasefile", .type = BLOBMSG_TYPE_STRING },
 150         [ODHCPD_ATTR_LEASETRIGGER] = { .name = "leasetrigger", .type = BLOBMSG_TYPE_STRING },
 151         [ODHCPD_ATTR_LOGLEVEL] = { .name = "loglevel", .type = BLOBMSG_TYPE_INT32 },
 152 };
 153
 154 const struct uci_blob_param_list odhcpd_attr_list = {
 155         .n_params = ODHCPD_ATTR_MAX,
 156         .params = odhcpd_attrs,
 157 };
 158
 159 static int mkdir_p(char *dir, mode_t mask)
 160 {
 161         char *l = strrchr(dir, '/');
 162         int ret;
 163
 164         if (!l)
 165                 return 0;
 166
 167         *l = '\0';
 168
 169         if (mkdir_p(dir, mask))
 170                 return -1;
 171
 172         *l = '/';
 173
 174         ret = mkdir(dir, mask);
 175         if (ret && errno == EEXIST)
 176                 return 0;
 177
 178         if (ret)
 179                 syslog(LOG_ERR, "mkdir(%s, %d) failed: %s\n", dir, mask, strerror(errno));
 180
 181         return ret;
 182 }
 183
 184 static void free_lease(struct lease *l)
 185 {
 186         if (l->head.next)
 187                 list_del(&l->head);
 188
 189         free(l->duid);
 190         free(l);
 191 }
 192
 193 static struct interface* get_interface(const char *name)
 194 {
 195         struct interface *c;
 196         list_for_each_entry(c, &interfaces, head)
 197                 if (!strcmp(c->name, name))
 198                         return c;
 199         return NULL;
 200 }
 201
 202 static void set_interface_defaults(struct interface *iface)
 203 {
 204         iface->managed = 1;
 205         iface->learn_routes = 1;
 206         iface->dhcpv4_leasetime = 43200;
 207         iface->ra_maxinterval = 600;
 208         iface->ra_mininterval = iface->ra_maxinterval/3;
 209         iface->ra_lifetime = -1;
 210 }
 211
 212 static void clean_interface(struct interface *iface)
 213 {
 214         free(iface->dns);
 215         free(iface->search);
 216         free(iface->upstream);
 217         free(iface->dhcpv4_router);
 218         free(iface->dhcpv4_dns);
 219         free(iface->dhcpv6_raw);
 220         free(iface->filter_class);
 221         memset(&iface->ra, 0, sizeof(*iface) - offsetof(struct interface, ra));
 222         set_interface_defaults(iface);
 223 }
 224
 225 static void close_interface(struct interface *iface)
 226 {
 227         if (iface->head.next)
 228                 list_del(&iface->head);
 229
 230         setup_router_interface(iface, false);
 231         setup_dhcpv6_interface(iface, false);
 232         setup_ndp_interface(iface, false);
 233         setup_dhcpv4_interface(iface, false);
 234
 235         clean_interface(iface);
 236         free(iface);
 237 }
 238
 239 static int parse_mode(const char *mode)
 240 {
 241         if (!strcmp(mode, "disabled"))
 242                 return RELAYD_DISABLED;
 243         else if (!strcmp(mode, "server"))
 244                 return RELAYD_SERVER;
 245         else if (!strcmp(mode, "relay"))
 246                 return RELAYD_RELAY;
 247         else if (!strcmp(mode, "hybrid"))
 248                 return RELAYD_HYBRID;
 249         else
 250                 return -1;
 251 }
 252
 253 static void set_config(struct uci_section *s)
 254 {
 255         struct blob_attr *tb[ODHCPD_ATTR_MAX], *c;
 256
 257         blob_buf_init(&b, 0);
 258         uci_to_blob(&b, s, &odhcpd_attr_list);
 259         blobmsg_parse(odhcpd_attrs, ODHCPD_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 260
 261         if ((c = tb[ODHCPD_ATTR_LEGACY]))
 262                 config.legacy = blobmsg_get_bool(c);
 263
 264         if ((c = tb[ODHCPD_ATTR_MAINDHCP]))
 265                 config.main_dhcpv4 = blobmsg_get_bool(c);
 266
 267         if ((c = tb[ODHCPD_ATTR_LEASEFILE])) {
 268                 free(config.dhcp_statefile);
 269                 config.dhcp_statefile = strdup(blobmsg_get_string(c));
 270         }
 271
 272         if ((c = tb[ODHCPD_ATTR_LEASETRIGGER])) {
 273                 free(config.dhcp_cb);
 274                 config.dhcp_cb = strdup(blobmsg_get_string(c));
 275         }
 276
 277         if ((c = tb[ODHCPD_ATTR_LOGLEVEL])) {
 278                 int log_level = (blobmsg_get_u32(c) & LOG_PRIMASK);
 279
 280                 if (config.log_level != log_level) {
 281                         config.log_level = log_level;
 282                         setlogmask(LOG_UPTO(config.log_level));
 283                 }
 284         }
 285 }
 286
 287 static double parse_leasetime(struct blob_attr *c) {
 288         char *val = blobmsg_get_string(c), *endptr = NULL;
 289         double time = strcmp(val, "infinite") ? strtod(val, &endptr) : UINT32_MAX;
 290
 291         if (time && endptr && endptr[0]) {
 292                 if (endptr[0] == 's')
 293                         time *= 1;
 294                 else if (endptr[0] == 'm')
 295                         time *= 60;
 296                 else if (endptr[0] == 'h')
 297                         time *= 3600;
 298                 else if (endptr[0] == 'd')
 299                         time *= 24 * 3600;
 300                 else if (endptr[0] == 'w')
 301                         time *= 7 * 24 * 3600;
 302                 else
 303                         goto err;
 304         }
 305
 306         if (time < 60)
 307                 time = 60;
 308
 309         return time;
 310
 311 err:
 312         return -1;
 313 }
 314
 315 static int set_lease(struct uci_section *s)
 316 {
 317         struct blob_attr *tb[LEASE_ATTR_MAX], *c;
 318
 319         blob_buf_init(&b, 0);
 320         uci_to_blob(&b, s, &lease_attr_list);
 321         blobmsg_parse(lease_attrs, LEASE_ATTR_MAX, tb, blob_data(b.head), blob_len(b.head));
 322
 323         size_t hostlen = 1;
 324         if ((c = tb[LEASE_ATTR_NAME]))
 325                 hostlen = blobmsg_data_len(c);
 326
 327         struct lease *lease = calloc(1, sizeof(*lease) + hostlen);
 328         if (!lease)
 329                 goto err;
 330
 331         if (hostlen > 1)
 332                 memcpy(lease->hostname, blobmsg_get_string(c), hostlen);
 333
 334         if ((c = tb[LEASE_ATTR_IP]))
 335                 if (inet_pton(AF_INET, blobmsg_get_string(c), &lease->ipaddr) < 0)
 336                         goto err;
 337
 338         if ((c = tb[LEASE_ATTR_MAC]))
 339                 if (!ether_aton_r(blobmsg_get_string(c), &lease->mac))
 340                         goto err;
 341
 342         if ((c = tb[LEASE_ATTR_DUID])) {
 343                 size_t duidlen = (blobmsg_data_len(c) - 1) / 2;
 344                 lease->duid = malloc(duidlen);
 345                 if (!lease->duid)
 346                         goto err;
 347
 348                 ssize_t len = odhcpd_unhexlify(lease->duid,
 349                                 duidlen, blobmsg_get_string(c));
 350
 351                 if (len < 0)
 352                         goto err;
 353
 354                 lease->duid_len = len;
 355         }
 356
 357         if ((c = tb[LEASE_ATTR_HOSTID])) {
 358                 errno = 0;
 359                 lease->hostid = strtoul(blobmsg_get_string(c), NULL, 16);
 360                 if (errno)
 361                         goto err;
 362         }
 363
 364         if ((c = tb[LEASE_ATTR_LEASETIME])) {
 365                 double time = parse_leasetime(c);
 366                 if (time < 0)
 367                         goto err;
 368
 369                 lease->dhcpv4_leasetime = time;
 370         }
 371
 372         list_add(&lease->head, &leases);
 373         return 0;
 374
 375 err:
 376         if (lease)
 377                 free_lease(lease);
 378
 379         return -1;
 380 }
 381
 382 int config_parse_interface(void *data, size_t len, const char *name, bool overwrite)
 383 {
 384         struct blob_attr *tb[IFACE_ATTR_MAX], *c;
 385         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb, data, len);
 386
 387         if (tb[IFACE_ATTR_INTERFACE])
 388                 name = blobmsg_get_string(tb[IFACE_ATTR_INTERFACE]);
 389
 390         if (!name)
 391                 return -1;
 392
 393         struct interface *iface = get_interface(name);
 394         if (!iface) {
 395                 iface = calloc(1, sizeof(*iface));
 396                 if (!iface)
 397                         return -1;
 398
 399                 strncpy(iface->name, name, sizeof(iface->name) - 1);
 400
 401                 set_interface_defaults(iface);
 402
 403                 list_add(&iface->head, &interfaces);
 404                 overwrite = true;
 405         }
 406
 407         const char *ifname = NULL;
 408         if (overwrite) {
 409                 if ((c = tb[IFACE_ATTR_IFNAME]))
 410                         ifname = blobmsg_get_string(c);
 411                 else if ((c = tb[IFACE_ATTR_NETWORKID]))
 412                         ifname = blobmsg_get_string(c);
 413         }
 414
 415 #ifdef WITH_UBUS
 416         if (overwrite || !iface->ifname[0])
 417                 ifname = ubus_get_ifname(name);
 418 #endif
 419
 420         if (!iface->ifname[0] && !ifname)
 421                 goto err;
 422
 423         if (ifname)
 424                 strncpy(iface->ifname, ifname, sizeof(iface->ifname) - 1);
 425
 426         if ((iface->ifindex = if_nametoindex(iface->ifname)) <= 0)
 427                 goto err;
 428
 429         iface->inuse = true;
 430
 431         if ((c = tb[IFACE_ATTR_DYNAMICDHCP]))
 432                 iface->no_dynamic_dhcp = !blobmsg_get_bool(c);
 433
 434         if (overwrite && (c = tb[IFACE_ATTR_IGNORE]))
 435                 iface->ignore = blobmsg_get_bool(c);
 436
 437         if ((c = tb[IFACE_ATTR_LEASETIME])) {
 438                 double time = parse_leasetime(c);
 439                 if (time < 0)
 440                         goto err;
 441
 442                 iface->dhcpv4_leasetime = time;
 443         }
 444
 445         if ((c = tb[IFACE_ATTR_START])) {
 446                 iface->dhcpv4_start.s_addr = htonl(blobmsg_get_u32(c));
 447
 448                 if (config.main_dhcpv4 && config.legacy)
 449                         iface->dhcpv4 = RELAYD_SERVER;
 450         }
 451
 452         if ((c = tb[IFACE_ATTR_LIMIT]))
 453                 iface->dhcpv4_end.s_addr = htonl(
 454                                 ntohl(iface->dhcpv4_start.s_addr) + blobmsg_get_u32(c));
 455
 456         if ((c = tb[IFACE_ATTR_MASTER]))
 457                 iface->master = blobmsg_get_bool(c);
 458
 459         if (overwrite && (c = tb[IFACE_ATTR_UPSTREAM])) {
 460                 struct blob_attr *cur;
 461                 unsigned rem;
 462
 463                 blobmsg_for_each_attr(cur, c, rem) {
 464                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 465                                 continue;
 466
 467                         iface->upstream = realloc(iface->upstream,
 468                                         iface->upstream_len + blobmsg_data_len(cur));
 469                         if (!iface->upstream)
 470                                 goto err;
 471
 472                         memcpy(iface->upstream + iface->upstream_len, blobmsg_get_string(cur), blobmsg_data_len(cur));
 473                         iface->upstream_len += blobmsg_data_len(cur);
 474                 }
 475         }
 476
 477         int mode;
 478         if ((c = tb[IFACE_ATTR_RA])) {
 479                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 480                         iface->ra = mode;
 481                 else
 482                         goto err;
 483         }
 484
 485         if ((c = tb[IFACE_ATTR_DHCPV4])) {
 486                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0) {
 487                         if (config.main_dhcpv4)
 488                                 iface->dhcpv4 = mode;
 489                 }
 490                 else
 491                         goto err;
 492         }
 493
 494         if ((c = tb[IFACE_ATTR_DHCPV6])) {
 495                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 496                         iface->dhcpv6 = mode;
 497                 else
 498                         goto err;
 499         }
 500
 501         if ((c = tb[IFACE_ATTR_NDP])) {
 502                 if ((mode = parse_mode(blobmsg_get_string(c))) >= 0)
 503                         iface->ndp = mode;
 504                 else
 505                         goto err;
 506         }
 507
 508         if ((c = tb[IFACE_ATTR_ROUTER])) {
 509                 struct blob_attr *cur;
 510                 unsigned rem;
 511
 512                 blobmsg_for_each_attr(cur, c, rem) {
 513                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 514                                 continue;
 515
 516                         struct in_addr addr4;
 517                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 518                                 iface->dhcpv4_router = realloc(iface->dhcpv4_router,
 519                                                 (++iface->dhcpv4_router_cnt) * sizeof(*iface->dhcpv4_router));
 520                                 if (!iface->dhcpv4_router)
 521                                         goto err;
 522
 523                                 iface->dhcpv4_router[iface->dhcpv4_router_cnt - 1] = addr4;
 524                         } else
 525                                 goto err;
 526                 }
 527         }
 528
 529         if ((c = tb[IFACE_ATTR_DNS])) {
 530                 struct blob_attr *cur;
 531                 unsigned rem;
 532
 533                 iface->always_rewrite_dns = true;
 534                 blobmsg_for_each_attr(cur, c, rem) {
 535                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 536                                 continue;
 537
 538                         struct in_addr addr4;
 539                         struct in6_addr addr6;
 540                         if (inet_pton(AF_INET, blobmsg_get_string(cur), &addr4) == 1) {
 541                                 iface->dhcpv4_dns = realloc(iface->dhcpv4_dns,
 542                                                 (++iface->dhcpv4_dns_cnt) * sizeof(*iface->dhcpv4_dns));
 543                                 if (!iface->dhcpv4_dns)
 544                                         goto err;
 545
 546                                 iface->dhcpv4_dns[iface->dhcpv4_dns_cnt - 1] = addr4;
 547                         } else if (inet_pton(AF_INET6, blobmsg_get_string(cur), &addr6) == 1) {
 548                                 iface->dns = realloc(iface->dns,
 549                                                 (++iface->dns_cnt) * sizeof(*iface->dns));
 550                                 if (!iface->dns)
 551                                         goto err;
 552
 553                                 iface->dns[iface->dns_cnt - 1] = addr6;
 554                         } else
 555                                 goto err;
 556                 }
 557         }
 558
 559         if ((c = tb[IFACE_ATTR_DOMAIN])) {
 560                 struct blob_attr *cur;
 561                 unsigned rem;
 562
 563                 blobmsg_for_each_attr(cur, c, rem) {
 564                         if (blobmsg_type(cur) != BLOBMSG_TYPE_STRING || !blobmsg_check_attr(cur, false))
 565                                 continue;
 566
 567                         uint8_t buf[256];
 568                         char *domain = blobmsg_get_string(cur);
 569                         size_t domainlen = strlen(domain);
 570                         if (domainlen > 0 && domain[domainlen - 1] == '.')
 571                                 domain[domainlen - 1] = 0;
 572
 573                         int len = dn_comp(domain, buf, sizeof(buf), NULL, NULL);
 574                         if (len <= 0)
 575                                 goto err;
 576
 577                         iface->search = realloc(iface->search, iface->search_len + len);
 578                         if (!iface->search)
 579                                 goto err;
 580
 581                         memcpy(&iface->search[iface->search_len], buf, len);
 582                         iface->search_len += len;
 583                 }
 584         }
 585
 586         if ((c = tb[IFACE_ATTR_FILTER_CLASS])) {
 587                 iface->filter_class = realloc(iface->filter_class, blobmsg_data_len(c) + 1);
 588                 memcpy(iface->filter_class, blobmsg_get_string(c), blobmsg_data_len(c) + 1);
 589         }
 590
 591         if ((c = tb[IFACE_ATTR_DHCPV6_RAW])) {
 592                 iface->dhcpv6_raw_len = blobmsg_data_len(c) / 2;
 593                 iface->dhcpv6_raw = realloc(iface->dhcpv6_raw, iface->dhcpv6_raw_len);
 594                 odhcpd_unhexlify(iface->dhcpv6_raw, iface->dhcpv6_raw_len, blobmsg_get_string(c));
 595         }
 596
 597         if ((c = tb[IFACE_ATTR_RA_DEFAULT]))
 598                 iface->default_router = blobmsg_get_u32(c);
 599
 600         if ((c = tb[IFACE_ATTR_RA_MANAGEMENT]))
 601                 iface->managed = blobmsg_get_u32(c);
 602
 603         if ((c = tb[IFACE_ATTR_RA_REACHABLETIME])) {
 604                 iface->ra_reachabletime = blobmsg_get_u32(c);
 605                 if (iface->ra_reachabletime > 3600000)
 606                         goto err;
 607         }
 608
 609         if ((c = tb[IFACE_ATTR_RA_HOPLIMIT])) {
 610                 iface->ra_hoplimit = blobmsg_get_u32(c);
 611                 if (iface->ra_hoplimit > 255)
 612                         goto err;
 613         }
 614
 615         if ((c = tb[IFACE_ATTR_RA_MTU])) {
 616                 iface->ra_mtu = blobmsg_get_u32(c);
 617                 if (iface->ra_mtu < 1280)
 618                         goto err;
 619         }
 620
 621         if ((c = tb[IFACE_ATTR_RA_OFFLINK]))
 622                 iface->ra_not_onlink = blobmsg_get_bool(c);
 623
 624         if ((c = tb[IFACE_ATTR_RA_ADVROUTER]))
 625                 iface->ra_advrouter = blobmsg_get_bool(c);
 626
 627         if ((c = tb[IFACE_ATTR_RA_MININTERVAL]))
 628                 iface->ra_mininterval =  blobmsg_get_u32(c);
 629
 630         if ((c = tb[IFACE_ATTR_RA_MAXINTERVAL]))
 631                 iface->ra_maxinterval = blobmsg_get_u32(c);
 632
 633         if ((c = tb[IFACE_ATTR_RA_LIFETIME]))
 634                 iface->ra_lifetime = blobmsg_get_u32(c);
 635
 636         if ((c = tb[IFACE_ATTR_RA_USELEASETIME]))
 637                 iface->ra_useleasetime = blobmsg_get_bool(c);
 638
 639         if ((c = tb[IFACE_ATTR_RA_PREFERENCE])) {
 640                 const char *prio = blobmsg_get_string(c);
 641
 642                 if (!strcmp(prio, "high"))
 643                         iface->route_preference = 1;
 644                 else if (!strcmp(prio, "low"))
 645                         iface->route_preference = -1;
 646                 else if (!strcmp(prio, "medium") || !strcmp(prio, "default"))
 647                         iface->route_preference = 0;
 648                 else
 649                         goto err;
 650         }
 651
 652         if ((c = tb[IFACE_ATTR_PD_MANAGER]))
 653                 strncpy(iface->dhcpv6_pd_manager, blobmsg_get_string(c),
 654                                 sizeof(iface->dhcpv6_pd_manager) - 1);
 655
 656         if ((c = tb[IFACE_ATTR_PD_CER]) &&
 657                         inet_pton(AF_INET6, blobmsg_get_string(c), &iface->dhcpv6_pd_cer) < 1)
 658                 goto err;
 659
 660         if ((c = tb[IFACE_ATTR_NDPROXY_ROUTING]))
 661                 iface->learn_routes = blobmsg_get_bool(c);
 662
 663         if ((c = tb[IFACE_ATTR_NDPROXY_SLAVE]))
 664                 iface->external = blobmsg_get_bool(c);
 665
 666         return 0;
 667
 668 err:
 669         close_interface(iface);
 670         return -1;
 671 }
 672
 673 static int set_interface(struct uci_section *s)
 674 {
 675         blob_buf_init(&b, 0);
 676         uci_to_blob(&b, s, &interface_attr_list);
 677
 678         return config_parse_interface(blob_data(b.head), blob_len(b.head), s->e.name, true);
 679 }
 680
 681 void odhcpd_reload(void)
 682 {
 683         struct uci_context *uci = uci_alloc_context();
 684
 685         while (!list_empty(&leases))
 686                 free_lease(list_first_entry(&leases, struct lease, head));
 687
 688         struct interface *master = NULL, *i, *n;
 689
 690         if (!uci)
 691                 return;
 692
 693         list_for_each_entry(i, &interfaces, head)
 694                 clean_interface(i);
 695
 696         struct uci_package *dhcp = NULL;
 697         if (!uci_load(uci, "dhcp", &dhcp)) {
 698                 struct uci_element *e;
 699                 uci_foreach_element(&dhcp->sections, e) {
 700                         struct uci_section *s = uci_to_section(e);
 701                         if (!strcmp(s->type, "host"))
 702                                 set_lease(s);
 703                         else if (!strcmp(s->type, "odhcpd"))
 704                                 set_config(s);
 705                 }
 706
 707                 uci_foreach_element(&dhcp->sections, e) {
 708                         struct uci_section *s = uci_to_section(e);
 709                         if (!strcmp(s->type, "dhcp"))
 710                                 set_interface(s);
 711                 }
 712         }
 713
 714         if (config.dhcp_statefile) {
 715                 char *path = strdup(config.dhcp_statefile);
 716
 717                 mkdir_p(dirname(path), 0755);
 718                 free(path);
 719         }
 720
 721 #ifdef WITH_UBUS
 722         ubus_apply_network();
 723 #endif
 724
 725         bool any_dhcpv6_slave = false, any_ra_slave = false, any_ndp_slave = false;
 726
 727         /* Test for */
 728         list_for_each_entry(i, &interfaces, head) {
 729                 if (i->master)
 730                         continue;
 731
 732                 if (i->dhcpv6 == RELAYD_HYBRID || i->dhcpv6 == RELAYD_RELAY)
 733                         any_dhcpv6_slave = true;
 734
 735                 if (i->ra == RELAYD_HYBRID || i->ra == RELAYD_RELAY)
 736                         any_ra_slave = true;
 737
 738                 if (i->ndp == RELAYD_HYBRID || i->ndp == RELAYD_RELAY)
 739                         any_ndp_slave = true;
 740         }
 741
 742         /* Evaluate hybrid mode for master */
 743         list_for_each_entry(i, &interfaces, head) {
 744                 if (!i->master)
 745                         continue;
 746
 747                 enum odhcpd_mode hybrid_mode = RELAYD_DISABLED;
 748 #ifdef WITH_UBUS
 749                 if (!ubus_has_prefix(i->name, i->ifname))
 750                         hybrid_mode = RELAYD_RELAY;
 751 #endif
 752
 753                 if (i->dhcpv6 == RELAYD_HYBRID)
 754                         i->dhcpv6 = hybrid_mode;
 755
 756                 if (i->dhcpv6 == RELAYD_RELAY && !any_dhcpv6_slave)
 757                         i->dhcpv6 = RELAYD_DISABLED;
 758
 759                 if (i->ra == RELAYD_HYBRID)
 760                         i->ra = hybrid_mode;
 761
 762                 if (i->ra == RELAYD_RELAY && !any_ra_slave)
 763                         i->ra = RELAYD_DISABLED;
 764
 765                 if (i->ndp == RELAYD_HYBRID)
 766                         i->ndp = hybrid_mode;
 767
 768                 if (i->ndp == RELAYD_RELAY && !any_ndp_slave)
 769                         i->ndp = RELAYD_DISABLED;
 770
 771                 if (i->dhcpv6 == RELAYD_RELAY || i->ra == RELAYD_RELAY || i->ndp == RELAYD_RELAY)
 772                         master = i;
 773         }
 774
 775
 776         list_for_each_entry_safe(i, n, &interfaces, head) {
 777                 if (i->inuse) {
 778                         /* Resolve hybrid mode */
 779                         if (i->dhcpv6 == RELAYD_HYBRID)
 780                                 i->dhcpv6 = (master && master->dhcpv6 == RELAYD_RELAY) ?
 781                                                 RELAYD_RELAY : RELAYD_SERVER;
 782
 783                         if (i->ra == RELAYD_HYBRID)
 784                                 i->ra = (master && master->ra == RELAYD_RELAY) ?
 785                                                 RELAYD_RELAY : RELAYD_SERVER;
 786
 787                         if (i->ndp == RELAYD_HYBRID)
 788                                 i->ndp = (master && master->ndp == RELAYD_RELAY) ?
 789                                                 RELAYD_RELAY : RELAYD_DISABLED;
 790
 791                         setup_router_interface(i, !i->ignore || i->ra != RELAYD_DISABLED);
 792                         setup_dhcpv6_interface(i, !i->ignore || i->dhcpv6 != RELAYD_DISABLED);
 793                         setup_ndp_interface(i, !i->ignore || i->ndp != RELAYD_DISABLED);
 794                         setup_dhcpv4_interface(i, !i->ignore || i->dhcpv4 != RELAYD_DISABLED);
 795                 } else
 796                         close_interface(i);
 797         }
 798
 799         ndp_handle_addr6_dump();
 800         uci_unload(uci, dhcp);
 801         uci_free_context(uci);
 802 }
 803
 804 static void handle_signal(int signal)
 805 {
 806         char b[1] = {0};
 807
 808         if (signal == SIGHUP) {
 809                 if (write(reload_pipe[1], b, sizeof(b)) < 0) {}
 810         } else
 811                 uloop_end();
 812 }
 813
 814 static void reload_cb(struct uloop_fd *u, _unused unsigned int events)
 815 {
 816         char b[512];
 817         if (read(u->fd, b, sizeof(b)) < 0) {}
 818
 819         odhcpd_reload();
 820 }
 821
 822 static struct uloop_fd reload_fd = { .cb = reload_cb };
 823
 824 void odhcpd_run(void)
 825 {
 826         if (pipe2(reload_pipe, O_NONBLOCK | O_CLOEXEC) < 0) {}
 827
 828         reload_fd.fd = reload_pipe[0];
 829         uloop_fd_add(&reload_fd, ULOOP_READ);
 830
 831         signal(SIGTERM, handle_signal);
 832         signal(SIGINT, handle_signal);
 833         signal(SIGHUP, handle_signal);
 834
 835 #ifdef WITH_UBUS
 836         while (init_ubus())
 837                 sleep(1);
 838 #endif
 839
 840         odhcpd_reload();
 841         uloop_run();
 842
 843         while (!list_empty(&interfaces))
 844                 close_interface(list_first_entry(&interfaces, struct interface, head));
 845 }
 846